Antifriction brake



' Jan. 3; 1928.

G.B.COLEMAN ANTIFRICTION BRAKE Filed Dec. 9, 1924 Patent d Jan. 3, 1928.

arrow or cnmroruvm.

11,654,790 A ENT oFrIc GEORGE 3. commie, or snnrrmncrso oanmonnm, "ASSIGNOR'TQ cerium .AUTO- MATICwTRANSMISSION COMPANY, 01' SAN rmorsco, CALIFORNIA, A'oonr'om- Application-fled December 9, 1-924. Serial No. 754,852.

The present invention relates to braking devices and has for its object the provision of an efiicient. and compact device of general :application although particularly adapted -6- for use with motor vehicles. In accordance with my invention the speed of a rotatable member is retarded by inertia reactions rather than by friction forces such as comnionly generated by friction drum and brake 10 band 'or analagous devices. 'IZhe basic rinciples of' he invention may be embodie in apparatus which difl'ers widely inform and appearance and, while I illustrate anddescribe two-forms of the invention, it will be understood that the design and arrangement of its component parts may be widely modified without'departing from the spirit ofthe invention. Inthe drawings? Fig. 1 is a side elevation of portion of a" retarding device embodying the invention; Fig; 2 is a side elevation of one of the rotatable wheels looking in the'same direc-' *tion as the'wheels are viewed in Figure 1'; and v 1 i Fig. 3 is an end view of this wheel showing its method of mounting. i In theo form illustrated the rotatableshaft is indicated at 50, the single spider which is employed, at 51', and the four wheelsor gears rotatably mounted on the ends of'the spider arms at 52, '5 Each of these wheels is ,rotatably mounted ona short stud shaft 53 "and has a sleeve portion 54 fixed thereto. 8' Formed on this'sleev'e portion a'refratchet teeth 55$ A radial member 56 has its inner.

' j end rotatably mounted on the sleeve and has at its outer end a weight 57 This member.

is also provided with a pawl 58 adapted to" v engage-the ratchet teeth 5 5jand a spring 59 for normall y holdi'n the pawl' in such engagement. Itwill be seen therefore that the radial member 56 can rotate relativelyto I the sleeve freely in one direction butis- 5 locked against rotation in tlfe opposite direction.

Each wheel 52 is in internal floating ring 60 the outer faceof which constitutes a cylindrical friction face adapted to be frictionally engaged by a brake band 61 adapted to be tightened or loosened by the usual brake operating levers 62, 63, 64 and connected mechanism.

' In 0 eration, with the brake band 61 in release position'and the shaft 50 rotating,

yatchets, the arms 56 are-rotated constant mesh with an the spider 51, gearing 60,- gears. 52 and I weights 57 rotate bodily therewith, the gears 52 belng at rest on their. own axes and the 4 arms 56 directed radially outward due to the centrifugal force of the-weights 57.1'10 lmpose a'braking action on the shaft 50, it

is only necessary to actuate the brake band 61, when the-ring 60 is brought to rest. The,

shaft 50, however, isnot brought to rest by the o eration but its continuous rotation,

the splder 51 being carried by it, results not only in the continued bodily rotation of the gears 52-but also rotation on-their ownaxes;

The :ratchets' 55 rotating in s'ynchroni sm'with the gears 52'andthepaw1s 58 engaging the onthe axes? of .the gears 52' and the. weights moved irrwardly,-until the arms reach radial positions with the weights dis osed between the stud shafts 53 and the 's aft 50. Having passed these inner radialpositions, however, they are carried suddenly outwardly by cen trifugal force, since then-they may swing free of the gears' 52. Having reached'the.

- outer radial positions, they would'ordinarily remain there but the gears 52 rotating on their own axes, the weightsiare. again swung inwardly by the engagement of the ratchets with the payvls and the same cycle of o era-' tion of the weights is repeated.' The welghts are thus successively moved inwardly against centrifugal force and thistendsto resist the rotation of the gears 52 on-their own axes and these successive oppositions to the axial rotation of the gears-must oppose the rota-- tion of the spider 51an'd therefore the shaft 50, since the ring 60 is at rest and the shaft 50 canthen rotate only by reason of the axial v rotation of v the gears '52. The mechanism thus provides for the/application of'a brak-.

ing actiononth'e shaft 50, by reason of pro- -'vidin'ga centrifugally controlled means the brake band 61 andthe shaft 50-.

.. overnin the o erative connection between invention, various other brakin or retarding dev'ices may be devised and t e invention is not limited to the forms thereof .illus- I trated and above described but 6am rehends thatthe design andarrangement'o its component parts may be modified to suitdiiferfent purposes and conditions.

' Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. Mechanisxif for retarding'or braking a rotatable member comprising an eccentricl-member, said element being 'revoluble with said member along a circular path centered on the axis of said member and being also ally weighted element having itsaxis disposed'parallel to the axis of said revoluble rotatable about its'own axis, and means for causing-rotation 101 said element on its axis in a direction opposite to the direction of rotation of said rotatable member, for the purpose: set forth, e t

2. Mechanism for retarding or braking a rotatable member comprising an eccentrically weightedfleleme'nt having its axis disposed parallel to the axis of said revoluble I member, saidelement being revoluble with said member along a' circular path-centeredon theaxis of said member and being also rotatable about its own axis, means for causing rotation; of said element on its axis in a direction 0 posite to the direction of rdtation of sai rotatable member,'said means including a ringconcentric with said revoluble' member and in constant engagement 7 with said element.

3. Mechanism for retarding or braking a rotatable .member comprising an eccentically weighted element having. its axis disposed parallel to the axis of said revoluble' member, said element bein revoluble with said member along a cirucu ar path centered on the axis of said member and being also tatlon of 'said'rotatable member, a ring mem--.- ber normally revoluble with said rotatable rotatable about its-own axis, meansfor causmg rotation at said element on; its axis in a direction opposite to the direction of ro-' member and means forretarding the same.

a 4. M'echanislm for retarding or braking'a' revolublemember comprising" a plurality of rotatable eccentricallyweighted. elements connected to'saidmember and bodilymovable therewith, and means for .causing said.

elements'to rotate in a direction opposite to that, of the revoluble member,ffor the purpose set forth. i

V 5. In a brake, ineombinationa revoluble shaft, an internally toothed ring gear com centric therewith, rotatable eccentricnlly element to. impose arestraining forceon the 'mally' at rest withtheother member but set of-a weight agalnst centrifu force.

of motion which consists in successively changing-from synchronous to asynchronous 1P operation a plurality. of inert m'.

- signature.

weighted gears carried by the shaft and meshing with said ring gear, the weighted gearsbeing revoluble on their own axes and bodil'y revoluble with the shaft and'mean's for holding said-ring gear against rotation, for the purpose set forth.. y n

6. A brake mechanism comprisinginormally means or retarding-theme, and an inert element operatively connected with the other of-said members and actuated. to impose a sfynchronously moving members and" restraining force on the same upon retardation of the first member. I i

ing member, an inert element normally at 7 brake mechanism comprising a movrest with respect to the moving member, and means for eiiecting relative-movement between the member and the inert'element to impose a restraining force on the former.

'8.- Abra-kc mechanism comprising a mov- .70 sing member, an inert element carried by and normally at rest with respect to, the-moving member, and means for efiect' "relatiye movement between-the member the inert former.

.. 9. A brake" mally meansand 'an inert element carried by .and nor- 12. The method of absor ing the energy of motion which consists in the changing from synchronous toasynchronous operationa plurality of inert masses. I

13. The method of bsorbing the I mechanism' comprising nor- ,sfynch'ronously mov1n members j and or arrestingthe mot on of the one, so

In testimony whereof I hereunte aflix my 4 L tenonen 13,; COLEMA I 

